McCarthy refused to check into a rehabilitation clinic to kick her addiction to the potent painkiller, and instead tackled the withdrawal process by sweating it out.

Talking about her book, she tells E! News, “(I took) eight, 10 a day. Trying to come off of it was awful. The detox was crazy bad. No, (I didn’t go to rehab). You just get off of them, sweating and freezing.”